New Zealand Transport Agency project manager Simon Underwood said the 27 strong group of Institution of Professional Engineers New Zealand members were on an ''interest visit'' - a chance to share experiences with others in the engineering sector.
A particular focus was the Caversham project's ''unique structural challenges'', owing to the ground conditions engineers had encountered below the surface.
Those challenges included a ''soft, slippery layer'' above the sandstone, an inactive fault line, and a 100sq m cavity that had to be filled with concrete grout.
The $44million, two stage project included the Lookout Point Bridge, a wider, smoother approach through the city's southern gateway, and a four lane road between Andersons Bay Rd and Lookout Point.
Work on the project was almost complete and the bridge was expected to open to traffic in late October or early November, Mr Underwood said.
